I have a 2017 ARIA 3601. My bedroom slide with the bed leaks water when it rains and the slide is closed. When it is open and it rains no leak. Now it is not coming in around the sides or top, but the water is getting inside the slide and running out on the floor. A slide is nothing more then a shoe box placed on its side, so how can rain get inside and run out on the bottom right corner. I have caulked everything I can see on the outside. The top of the slide is dry.
Had same issue 2015 Vegas. Replaced all seals to start with and final fix being sure when slide out all seals lined up properly at top where they meet
You need to check inside as much as possible and outside
I have small telescoping camera I use a lot to get in dark corners
Trial and error on this fix
You could b holding water in that awning that usually extends when out
Takes some time to go thru steps and use water hose to check what is going on
My issue started after 3 in driving rain and took couple trips to repair shop to finally get seals right
I am having the same issue with the bedroom slide in my 2019 Aria 3901. It only leaks when the slide is in. I also just caulked and cannot see any reason for the leak. Let's keep everyone updated on how we fix the problem.